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1 From the Arizona Health Sciences Center, School of Medicine, Tucson
2 From the Department of Internal Medicine, Hematology Oncology Section, Veterans Affairs Medical Center; the Arizona Cancer Center, Arizona Health Sciences Center, Tucson
3 From the Department of Internal Medicine, Division of Respiratory Sciences, University of Arizona, and Pulmonary Section, Veterans Affairs Medical Center, Tucson
4 From the Arizona Cancer Center, Arizona Health Sciences Center, Tucson
To determine the effect of nutritional agents on lipid peroxidation, 10 smokers were given 6 mg beta carotene, 200 IU vitamin E, and 250 mg vitamin C 4 times daily for 3 weeks. Lipid peroxidation was assessed by measuring baseline and postsupplementation levels of exhaled ethane. There was a 29% decrease in mean (±SD) exhaled ethane (4.06±1.49 vs 2.90±1.29 pmol·kg
1·min
1), with individual levels decreasing in 8 of the 10 smokers (p<0.05, Wilcoxon sign rank test). Three nonsmokers had very low baseline levels of ethane that did not change with supplementation. Ethane production correlated with active (packs per day) and lifelong (pack-years) tobacco consumption. Also, a strong correlation was found between the decline in ethane output after micronutrient supplementation and the presupplement FEV1. Therefore, antioxidant vitamin supplementation resulted in attenuation of smoking-related lipid peroxidation, and the decreases in ethane production appears to be associated with preserved lung function.
Key Words: ascorbic acid carotene ethane lipid peroxidation smoking vitamin E
Submitted on November 7, 1995
Accepted on January 18, 1996
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